Used for making models to be reproduced by the lost wax casting process. They can be sawed, filed or carved.Will stand rough handling and will not soften in yourhands. Available in three degrees of hardness, designated by color, and in a variety of shapes. Green, cannot be flexed and melts at 240°F (116°C). Purple, has some flexibility and melts at 240°F (116°C). Blue will bend 90° in 1⁄8" thickness and melts at 240°F (116°C).